package com.atguigu.lease.web.admin.custom.interceptor;

import com.atguigu.lease.common.context.LoginUser;
import com.atguigu.lease.common.context.LoginUserContext;
import com.atguigu.lease.common.exception.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import com.atguigu.lease.common.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * @author XC
 * @version 1.0
 * @description
 * @knowledge
 */
@Component
public class AuthenticationInterceptor implements HandlerInterceptor {
    // 拦截发送到控制器的请求
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("access_token");

        if (token == null) {
            throw new LeaseException(ResultCodeEnum.ADMIN_LOGIN_AUTH);
        } else {
            // 解析 token
            Claims claims = JwtUtil.parseToken(token);
            Long userId = claims.get("userId", Long.class);
            String userName = claims.get("userName", String.class);

            /*
            // (1) 将解析出来的数据，保存到 request请求域中
            request.setAttribute("userId", userId);
            request.setAttribute("userName", userName);
            */

            // (2) 将解析出来的数据，保存到 threadLocal对象中
            LoginUserContext.set(new LoginUser(userId, userName));
        }

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        /*
        // (1) 删除 request请求域中的数据
        request.removeAttribute("userId");
        request.removeAttribute("userName");
        */

        // (2) 删除 threadLocal对象中的数据
        LoginUserContext.remove();
    }
}
